Composition for lithographing ink



Patented May 21, 1929.

PATENT OFFICE.

OTTO E. HARDER, OF ST. PAUL, MINNESOTA.

COMPOSITION FOR LITHOGRAPEING INK.

No Drawing.

This invention relates to a composition for use with printers and lithographers inks, for the purposeof securing better results in the printed copies and overcoming certain objections. In certain printing operations such as in ofiset lithography, where water and acid are used in the process of conveying the color to the printed sheet, the steel rollers in the offset press often become oxidized. This condition results in impaired distribution'l of the ink, which in turncauses a defective print.

It is an object of this invention to provide a composition adapted to be mixed with the ink which will form an aid to the vehicle of color, usually giving a better setting and giving an improved color and clearer print.

It is a further object of the invention to provide a composition adapted to be mixed with ink which is transparent and one which will not change or modify the color.

It is still another object of the invention to provide a composition adapted to be used with ink which will act as a.shortener for the ink.

These and other objects and advantages will be fully set forth in the following description giving the constituents of applicants composition and the method of making the same.

The composition consists of 73% petrolatum oil, 21% paraffin, 3% magnesium carnate, and 3% oleic acid by weight. The petrolatum oil and the parafiin are heated so as to be quite fluid and the other constituents are then mixed with the heated fluid and the mixture well stirred or beaten. The composition then cools into the form of a paste which is readily and easily mixed with the printers ink or lithographers ink.

In the use of the composition, one part of the same is mixed with from five to fifteen parts of ink, but a greater or lesser amount of the composition may be applied, depending upon the character of the ink or the character of the work to be done. The mixture readily combines with the inks and 1mproved results are secured with the inks as a. result of the use of the composition. With the use of the composition, the color Application filed June 11,

1927. Serial No. 198,307.

material is distributed in a better manner and a clearer print obtained. The composition is quite transparent so that there is no tendency to change or darken the tone of the color. The most delicate colors can therefore be printed in an attractive manner.

In ofi'set lithography, where the impression is usually transferred to a rubber blanket from the metal'plate or form, and the impressions taken from the rubber blanket, water and acid are used in the proc ess of conveying the color to the paper. The steel rollers in theoffset press often become oxidized or affected by the acid. The water and acid are used the wash the plate on the press to get the proper distribution of the ink and sharpness to the impression. The acid thus reaches the inking rollers and the steel rollers used on the press. This causes impaired distribution of the ink and results in defective prints. WVith the aid of the present composition, an alert operator by consistent manipulation of the water and acid when color printing is being done, will minimize the objectionable action on the rolls or eliminate it altogether. The composition is a distinct water and acid resistant and the objectionable action on the rolls is thus prevented. The composition also acts as a shortener for the ink, causing a sharp impression and a quick drying thereof. The composition has been successfully used in printing and lithography, and the efficiency thereof amply demonstrated. It will, of

course, be understood that various changes may be made in the constituents of the composition, the proportions thereof, and in the manner of mixing, Without departing from the scope of applicants invention, which, generally stated, consists in a composition capable of carrying out the objects above set forth, such as defined in the appended claims.

What is claimed is 1. A composition for use with printers ink embodying a mixture of petrolatum oil, paraflin, and .magnesium carbonate.

2. A composition for use with printers and lithographers ink, embodying a mixture of petrol-atum oil, paraffin, magnesium carbonate and oleic acid.

3. A composition for use with printers and lithographers ink, embodying a mixture of the following constituents in the respective percentages given Per cent Petrolatuln oil 73 Paraffin 21 Magnesium carbonate 3 Oleic acid 3 OTTO E. HARDER. 

